The effect of fuel formulation on the exhaust emissions of spark ignition engines

The research described in this dissertation examined the effects that fuel formulation can have on the regulated
exhaust emissions produced by spark ignition engines in a South African context. Typical South African engine
technology, and fuels representative of available fuels were investigated. To broaden the scope and provide
information on as many fuel parameters as possible, fuel formulations other than typical retail fuels were also
investigated. In order to gain insight into the mechanisms taking place, combustion analysis was performed on
measured cylinder pressure traces